Pencil



J. P. LYNN April 9, 1935.

PENCIL Filed Sept. 29, 1955 cerned particularlywith meansfor"frictionally' Patented pr. 9, 11935 .'Iohnl?. Sycamore,assig'nortojDur-O- .j LtePelicl Company, Sycamore, Ill., a corporaf`Applicatnsteihieigea iosasei-iaiuo. 691,422

" i'vciitiagwol. 12in-1n] fj .This invention #relates ,generally v.tomechanical pencils havingya lead propelling means adapti ed to beactuated byrotation of ai tip relative to the body. Thepresentgimprovements: arefconholding the tip in coop'erativerelationwith the body; and with meansxfor `steadyingfthe utip relativeto the body. 1 `1 f 1- These and `other objects, `as will hereinafterappear, are attained in a pencil having a iconstruction of which,certain suggestive :embodiments are setforth inthe accompanyingLdrawing, whereiny l Figure l is an enlarged longitudinal sectional Viewthrough, the pencil;

Fig.` 2 is an enlarged fragmentarysectional View of the tip endoftheupencil;

Fig. 3 is an enlarged. transverse sectional View, taken online 3-.3 ofFig. 1; Fig. 4 isa View in perspective of the coupling sleeve per se; H'l .1 I Fig. 5 shows partly in section and partlyin elevation a modifiedpencil construction; andl Fig. 6 is an enlarged transverse sectionalview, taken on line 6 6 of Fig. 5. Y i

Referring to Figs. 1 to #l` inclusiveJ' haveshown therein `a pencil`having a body `A madev desirably 0f a suitable composition material,and provided with an axial chamber 2 0 whichjmay vextend'for l theentire length of the body.` Afradial groove 2| in which may track the;feed pin of thelead propelling mechanism is formed in the'chamberthroughout its length. `At its head, the exterior surface' ofthe bodyVis slightly'rece'ssed to receive in flush relation a cap 22 whichfformsa closure forthe'chamber atthat end.

grip portion 29 -of bakelite or other appropriate material. This gripwhich starts from the shoul` der 26 extends upwardly in cone fashion as"a continuation of the lower cone walls of the tip.

In its upper region, the grip portionproceeds cylindrically as at 30,its diameter, inside and out, being Vsuch as to coincide with thecorresponding surfaces of the body when fitted in abutting relationthereto. The connection between the tip tube 25 and grip portion 29 may:beof any approved kind,;stee

ppitched threads 3|4 being suggested for the purpose. Fitted within thetube 25` of the vtip is one end. of a spiral Vtube C. This tube may bebrazed or otherwise Ysecurely anchored Within,` the tip s o as to extendupwardly therefrom through the axial chamber of the pencil bodyfor thefull length thereof'. `The spiral tube may conveniently be.

formed Vfrom -a ilat, ribbon of metal which is `rolled about asuitablemandrel, the convolutions of the tube being separated to leavevan open spiral' slot 35 which continues without interruption for the-full lengthof the tube. y A

To connectthe' tip removably and ialso rotat,` ably to the body, wherebyitfrnay` serve Aaslgan operating medium for the Vlead propellingmechanism, .I utilize a coupling sleeve D Y(see Fig. 4). which, in theform shown, consistsV of asmall metal plate bent into cylindrical formwith its proximate edges suiliciently separated toprovide an opensloti31. A slit `3B may also be providedl i through the walls of thesleeve for perhaps onef half its length on the side thereof which ispreferably opposite the slot 31. The `sleeve end `re'-` mote `fromtheslit 38 is desirably` provided on its Vex-teriorwith steep pitchedthreads 39 which have l `'sleeve within the body, the axialchamber'theref` within is `desrably enlarged 'somewhat at the thechamber which extends longitudinally 'of the body. VWhen the sleeve isanchored in place, it is positioned rotatively so that the slot 3laligns with the groove 2| inthe chamber.

The threaded end of the coupling sleevemay be permanently` and immovablyembedded within the enlarged chamber` at the' lower end of thepencilbody. The remaining portion of the sleeve, however, viz., the end`wherein the. slit 38' is formed, remainsprotruded beyond theend ofthepencilbody. Byreason of the slot 31 and slit 38, the walls of thesleeveare divided into spring sections which tend normally to` expand.When 'lower end` of the pencil, whereby the inner sur.- faceof thesleeve is disposed in` coincidence with;

theltip, together'with its helical tube, is applied `to the pencil body,the tubeis extended through the couplingsleeve, free of contacttherewith; theinner surface of thegrip portion of the tip,

however, is engagedby the outer surface of the coupling sleeve springsections which are free tion of the tip to the body requires that these`for `radial expansion. .Accordinglyg the applica-

